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JSON.stringify(dynamicVariables).replace(/\"/g, \""\")\n : \"\";\n\n const dynamicVarsAttr = dynamicVarsJson ? `dynamic-variables='${dynamicVarsJson}'` : \"\";\n\n return `\nNeed help?\n\n`;\n};\n\n/* ------------------------------------------------------------------------ */\n/* HTML transformer – uses deno_dom DOMParser */\n/* ------------------------------------------------------------------------ */\nfunction toProxyUrl(raw: string, proxyOrigin: string, targetSite: string, proxyQueryString: string): string {\n const targetDomainRe = new RegExp(\n `^https?:\\\\/\\\\/${targetSite.replace(/^https?:\\/\\//, \"\").replace(/\\/$/, \"\")}\\\\/?`,\n \"i\",\n );\n\n // Absolute link to the target domain → strip host and add proxy params\n if (targetDomainRe.test(raw)) {\n const path = raw.replace(targetDomainRe, \"\");\n const separator = path.includes(\"?\") ? \"&\" : \"?\";\n return `${proxyOrigin}/${path}${proxyQueryString ? separator + proxyQueryString : \"\"}`;\n }\n // Relative / root‑relative link → prefix proxyOrigin and add proxy params\n if (!/^(?:https?:|\\/\\/|#|mailto:|tel:)/i.test(raw)) {\n const cleanPath = raw.replace(/^\\/+/, \"\");\n const separator = cleanPath.includes(\"?\") ? \"&\" : \"?\";\n return `${proxyOrigin}/${cleanPath}${proxyQueryString ? separator + proxyQueryString : \"\"}`;\n }\n // Anything else → leave untouched\n return raw;\n}\n\nasync function transformHtml(\n html: string,\n proxyOrigin: string,\n targetSite: string,\n agentId: string,\n dynamicVariables: Record,\n proxyQueryString: string,\n): Promise {\n const parser = new DenDomParser();\n const doc = parser.parseFromString(html, \"text/html\") as HTMLDocument;\n if (!doc) return html;\n\n // ── rewrite links / forms ────────────────────────────────────────────\n (doc.querySelectorAll(\"a[href]\") as unknown as Element[]).forEach((a) => {\n a.setAttribute(\"href\", toProxyUrl(a.getAttribute(\"href\")!, proxyOrigin, targetSite, proxyQueryString));\n });\n\n (doc.querySelectorAll(\"form[action]\") as unknown as Element[]).forEach((f) => {\n f.setAttribute(\"action\", toProxyUrl(f.getAttribute(\"action\")!, proxyOrigin, targetSite, proxyQueryString));\n });\n\n // ── inject help widget with dynamic variables ────────────────────────\n const body = doc.body ?? doc.querySelector(\"body\");\n if (body) {\n body.innerHTML += getHelpWidgetHtml(agentId, dynamicVariables);\n }\n\n return \"\\n\" + doc.documentElement!.outerHTML;\n}\n\n/* ------------------------------------------------------------------------ */\n/* Main handler */\n/* ------------------------------------------------------------------------ */\nexport default async function handler(req: Request): Promise {\n try {\n const incoming = new URL(req.url); // https://proxy/<…>\n const searchParams = new URLSearchParams(incoming.search);\n\n // Get target site from query parameter\n const targetSite = searchParams.get(\"targetSite\");\n if (!targetSite) {\n return new Response(\"Missing required targetSite query parameter\", { status: 400 });\n }\n\n // Validate target site URL\n let targetUrl: URL;\n try {\n targetUrl = new URL(targetSite);\n } catch {\n return new Response(\"Invalid targetSite URL\", { status: 400 });\n }\n\n // Get agent ID (use default if not specified)\n const agentId = searchParams.get(\"agentId\") || DEFAULT_AGENT_ID;\n\n // Extract all query parameters except agentId\n const dynamicVariables: Record = {};\n for (const [key, value] of searchParams.entries()) {\n if (key !== \"agentId\") {\n dynamicVariables[key] = value;\n }\n }\n\n // Create proxy query string to append to rewritten URLs (includes targetSite and agentId)\n const proxyParams = new URLSearchParams();\n proxyParams.set(\"targetSite\", targetSite);\n if (searchParams.has(\"agentId\")) {\n proxyParams.set(\"agentId\", agentId);\n }\n // Add other dynamic variables\n for (const [key, value] of Object.entries(dynamicVariables)) {\n proxyParams.set(key, value);\n }\n const proxyQueryString = proxyParams.toString();\n\n // Build upstream URL\n const path = incoming.pathname.replace(/^\\/+/, \"\");\n const upstreamSearchParams = new URLSearchParams();\n\n // Add non-proxy query parameters to upstream request\n for (const [key, value] of searchParams.entries()) {\n if (key !== \"targetSite\" && key !== \"agentId\") {\n upstreamSearchParams.append(key, value);\n }\n }\n\n const upstreamSearch = upstreamSearchParams.toString();\n const upstream = `${targetUrl.origin}/${path}${upstreamSearch ? \"?\" + upstreamSearch : \"\"}`;\n\n const resp = await fetch(upstream, {\n method: req.method,\n headers: req.headers,\n body: [\"GET\", \"HEAD\"].includes(req.method) ? undefined : await req.blob(),\n redirect: \"follow\",\n });\n\n const headers = new Headers(resp.headers);\n const cType = headers.get(\"content-type\") ?? \"\";\n const status = resp.status;\n\n if (cType.includes(\"text/html\")) {\n const html = await resp.text();\n const out = await transformHtml(\n html,\n incoming.origin,\n targetUrl.origin,\n agentId,\n dynamicVariables,\n proxyQueryString,\n );\n return new Response(out, { status, headers });\n }\n\n // Non‑HTML resources → stream untouched\n return new Response(await resp.blob(), { status, headers });\n } catch (err: any) {\n console.error(\"Proxy error:\", err);\n return new Response(`Proxy error: ${err.message}`, { status: 500 });\n }\n}","deleted","label","generic11",[98],"permalink","https://www.val.town/x/curtcox/GenericAgentProxy/code/index.ts","extension","actionData","errors"]